The short answer
SEO gets you ranked in Google's list of links. AEO, answer engine optimisation, gets you into the answer boxes and featured snippets. GEO, generative engine optimisation, gets you cited inside AI answers from ChatGPT, Gemini, Claude and Perplexity. They overlap, and most UK businesses now need all three. The foundation is the same: clear, credible, well-structured content.
Three acronyms, a lot of noise, and a fair amount of people selling one as the death of the others. The truth is calmer. These are three overlapping jobs, not three warring camps, and they mostly share the same foundations. Here is what each one actually means.
What is SEO?
Search engine optimisation is the original discipline: making your pages rank in the standard Google results, the list of blue links. It is about relevance, authority and technical health, and for most businesses it is still where the majority of findable traffic comes from.
What is AEO?
Answer engine optimisation is about winning the direct answer. The featured snippet at the top of Google, the "people also ask" boxes, the reply a voice assistant reads out. AEO means structuring a page so a search engine can lift a clean, correct answer straight from it.
What is GEO?
Generative engine optimisation is the newest of the three. It is about being named and cited inside the answers that AI tools generate, ChatGPT, Google's AI answers, Gemini, Claude and Perplexity. When someone asks an AI to recommend a business or explain a topic, GEO is what decides whether your brand is in that answer.
How do they compare?
| Discipline | Optimises for | Where you show up | Key move |
|---|---|---|---|
| SEO | Ranking in search results | Google's list of links | Relevance, authority, technical health |
| AEO | Direct answers | Featured snippets, answer boxes, voice | Clear answers under question headings |
| GEO | Being cited by AI | ChatGPT, Gemini, Claude, Perplexity | Credible, quotable, well-sourced content |
Do they compete, or stack?
They stack. A page that ranks well, answers the question cleanly and reads as credible tends to do all three jobs at once. Google's own AI answers often draw on pages that already rank, so strong SEO feeds GEO rather than fighting it. You are not choosing one. You are building one solid page that works everywhere.
Which one does your business need first?
Get the foundation right in order. SEO first, because without findable, credible content you have nothing for the others to build on. Then AEO, by structuring your best pages to answer real questions directly. Then GEO, by making those pages the sort of authoritative, well-sourced source an AI wants to quote. In practice you build all three into the same page rather than running three projects.
What actually gets you cited by AI?
Research into generative engine optimisation found that specific moves lift how often a page is cited. Adding relevant quotations raised citation share by around 41 percent, adding statistics by around 31 percent, and adding clear inline citations by around 28 percent. The lesson is blunt: credibility and structure win. Vague, unsourced marketing copy does not get quoted.
Where the three actually conflict
The stacking story is true, but it hides one real tension worth naming. Old-school SEO habits push you towards repetition: the same phrase worked into the heading, the intro, the subheadings and the alt text, because that was once how relevance was signalled. Generative engines want almost the opposite. They lift passages that stand on their own and read like a person explaining something, and a paragraph written to hit a keyword density target reads exactly like what it is.
The second conflict is length. A lot of SEO advice still rewards the 2,500-word guide that buries the answer somewhere in the middle. AEO wants the answer in the first fifty words. You can satisfy both, but only deliberately: lead with the direct answer, then go deep for the readers and the rankings. Do not make an AI dig for it.
The third is freshness theatre. Changing a date to look current does nothing for any of the three, and for GEO it can actively hurt you, because the engines increasingly cross-check claims against other sources. If the substance has not changed, say when it was reviewed rather than pretending it was rewritten.
How to measure each one
This is where most people come unstuck, because the three have very different levels of measurement maturity. Be honest with yourself about which numbers you can actually trust.
| Discipline | Where to look | How reliable |
|---|---|---|
| SEO | Search Console impressions, clicks, average position; analytics sessions from organic | Mature. Imperfect but trustworthy enough to act on. |
| AEO | Search Console for queries where you rank but clicks are low, which often means the answer was shown without the visit; manual checks of snippet and "people also ask" boxes | Indirect. You infer it rather than read it off a dashboard. |
| GEO | Manual prompt testing across ChatGPT, Gemini, Claude and Perplexity; referral traffic from AI tools in analytics; brand-mention tracking | Immature. Non-deterministic answers mean a single test proves very little. |
The practical consequence is that GEO has to be measured as a trend, not a fact. Ask the same ten buying-intent questions once a month, record whether you appeared and who did, and watch the direction of travel over a quarter. Anyone selling you a precise AI visibility percentage is selling you a number with more confidence than the underlying data supports.
One measurement trap deserves a warning. Referral traffic from AI tools will understate their influence, because a great many people read an AI answer, form a view and then search for your brand by name. If your direct and brand-search traffic is rising while your generic organic clicks fall, that is often AI working, not failing.
A sensible order of work
If you are starting from scratch, resist doing all three at once. The order below front-loads the work that everything else depends on.
First, fix findability. Make sure your important pages are indexed, load quickly, are not duplicating each other, and say plainly what you do and where you do it. This is unglamorous SEO and there is no route around it: a page an engine cannot find or index cannot be cited by anything.
Second, restructure your best pages for extraction. Take your ten most commercially important pages and give each a direct answer near the top, question-shaped headings, and self-contained paragraphs. This is the single highest-return change for both AEO and GEO, and it is editing rather than writing.
Third, build the credibility signals. Named authors with real expertise, specific figures with sources, clear dates, and consistent facts about your business wherever it appears elsewhere on the web. This is the slowest part and the hardest for a competitor to copy, which is rather the point.
AEO vs GEO vs SEO – frequently asked questions
What is the difference between SEO, AEO and GEO?
SEO gets you ranked in Google's list of links. AEO gets you into direct answer boxes and featured snippets. GEO gets you cited inside AI-generated answers from tools like ChatGPT and Perplexity. They overlap and share the same foundations.
Is GEO replacing SEO?
No. GEO sits on top of SEO. Strong, credible content that ranks well is exactly what AI tools tend to cite, so good SEO feeds GEO. You need both, built into the same pages.
Which is most important for my business?
Start with SEO, because everything else builds on findable, credible content. Then structure your best pages for direct answers (AEO), then make them the kind of authoritative source AI wants to quote (GEO).
How do I get cited by ChatGPT?
Publish clear, well-structured, credible content: a direct answer near the top, question-style headings, named sources and specific figures, and clean formatting an AI can lift. See our guide to writing content AI will quote.
Do I need different content for SEO, AEO and GEO?
Not usually. One well-built page can do all three. The differences are in structure and credibility, not in producing three separate versions of everything.
How do I measure whether GEO is working?
Treat it as a trend rather than a metric. Pick ten questions a genuine buyer would ask, run them across ChatGPT, Gemini, Claude and Perplexity once a month, and record whether you were mentioned and who else was. Also watch brand and direct traffic, because many people read an AI answer and then search for you by name, which means AI referral traffic alone understates the effect.
Does schema markup help with AI citations?
It helps indirectly. Schema will not make a model cite you, but it makes your facts unambiguous — what the page is, who wrote it, when it was updated, what your business does and where. That clarity feeds the search indexes many AI tools draw on. Get the content and structure right first; schema is a multiplier, not a substitute.
Will AI search reduce my website traffic?
For informational queries, very possibly, because the answer is delivered without a click. That is why the goal shifts from traffic alone to being the cited source, and why commercial pages matter more than ever. People still visit to buy, book, compare and contact — so protect and sharpen those pages rather than mourning the loss of clicks on definitions.
Which Oxford AI School training fits this need?
Learn the method we run on our own content. GEO workshops in Oxfordshire, London, across the UK and live online.
Want to be the answer, not just a result?
Our Introduction to GEO workshop shows your team how to earn citations from AI search, using the same methods we use on our own content.
Book Introduction to GEO How to write content AI will quote
Harry Lang runs The Oxford AI School, teaching teams and businesses the basics of AI in a fun, easy and practical way. A marketing leader turned AI trainer, he can be reached at Learn@TheOxfordAISchool.com.